jQuery.fn.extend({
	uploadPreview: function (opts) {
		var _self = this,
			_this = $(this);
		opts = jQuery.extend({
			Img: "ImgPr",
			Width: 100,
			Height: 100,
			ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],
			Callback: function () {}
		}, opts || {});
		_self.getObjectURL = function (file) {
			var url = null;
			if (window.createObjectURL != undefined) {
				url = window.createObjectURL(file)
			} else if (window.URL != undefined) {
				url = window.URL.createObjectURL(file)
			} else if (window.webkitURL != undefined) {
				url = window.webkitURL.createObjectURL(file)
			}
			return url
		};
		_this.change(function () {
			if (this.value) {
				if (!RegExp("\.(" + opts.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {
					alert("选择文件错误,图片类型必须是" + opts.ImgType.join("，") + "中的一种");
					this.value = "";
					return false
				}
				if ($.browser.msie) {
					try {
						$("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))
					} catch (e) {
						var src = "";
						var obj = $("#" + opts.Img);
						var div = obj.parent("div")[0];
						_self.select();
						if (top != self) {
							window.parent.document.body.focus()
						} else {
							_self.blur()
						}
						src = document.selection.createRange().text;
						document.selection.empty();
						obj.hide();
						obj.parent("div").css({
							'filter': 'progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)',
							'width': opts.Width + 'px',
							'height': opts.Height + 'px'
						});
						div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src
					}
				} else {
					$("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))
				}
				opts.Callback()
			}
		})
	}
});